System and method for use in optical communication

A method of deciphering optical signal, the method comprising:

• receiving an encrypted input optical signal;
• providing a decipher pump optical signal having a predetermined wavelength and selected amplitude profile;
• interacting said encrypted input optical signal with said decipher pump optical signal providing an output/idler signal;
• and
• applying a reverse chirp to said idler signal to provide a deciphered output signal in a form of one or more series of pulses.

An encryption system, comprising:

• input and output ports configured respectively for receiving an input optical signals and transmitting output optical signals;
• signal dispersion unit configured for applying certain level of group velocity dispersion on said input signals thereby generating a chirped input signal;
• a pump signal source configured for providing pump optical signal having a predetermined wavelength and amplitude profile;
• and
• a cross-correlation module configured interacting said chirped input signal with said pump optical signal to thereby generate an encrypted output optical signal.

An optical decryption system, comprising:

• input and output ports configured respectively for receiving an input optical signals and transmitting output optical signals;
• a pump signal source configured for providing pump optical signal having a predetermined wavelength and amplitude profile;
• a cross-correlation module configured interacting said input signal with said pump optical signal to thereby generate an encrypted output optical signal;
• and
• signal dispersion unit configured for applying certain level of group velocity dispersion on said input signals.